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Jumper
4.1.2
Daughter Card Standalone Power Input
A terminal power input is provided on the daughter card to enable use of the daughter card without the
motherboard.
The connections of the power terminal are detailed in Figure 14.
The power terminal does not connect to the 5.0V_LR power rail which is
powered by the 5V linear regulator when used with the motherboard. This
rail is powering the VDD_HV_DAC (DAC supply), VDD_HV_RAW
(AFE supply) and VDD_HV_ADCREFxx (ADC reference voltage).
When using the daughter card standalone (without the motherboard) it is
required to connect the 5.0V_LR and the 5.0V_SR rail in order for the
microcontroller to come out of reset. Refer to section 4.11 for more
information.
4.2
Reset Circuit
To enable standalone use the reset circuitry is placed on the daughter card. It consist of a reset switch
that is connected to RESET_B via a jumper, and an external voltage monitoring IC connected to
VREG_POR_B. The RESET_B signal is also connected to the signal RST-SW that is connected to the
mother board to reset peripherals. A yellow LED (D2) is used to indicated RESET_B reset situations,
and a red LED (D9) indicates VREG_POR_B reset situations.
The EVB reset circuit provides the following functionality:
Table 8. MCU power selection jumpers
J5
Connects Digital HV supplies to 3.3V_SR
J2
Connects Digital LV supplies to 1.25V_SR
J7
Connects AFE Supply to 3.3V_LR via LDO
J3
Connects AFE Supply to 3.3V_SR via LDO
Figure 14. Terminal power input connections
Description
NOTE
S32R274 EVB User Guide
18
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